Preheated Biodiesel Derived from Vegetable Oil on Performance and Emissions of Diesel Engines: A Review 

Abstract

This present study discusses the effects of preheated biodiesel and its blends on the performance and emissions of diesel engines. Limited supply of fossil fuel makes biodiesel as one of the major solution for this current situation. However, in using biodiesel and its blends as fuel had created few problems such as poor fuel droplet formation and atomization that consequently result on lots of carbon formation deposit on the valves and injector choking. These problems occur due to the effect of higher viscosity of the biodiesel and its blends itself. This paper reviews the recent research on the effects of preheated biodiesel on viscosity and thus influences to the performance and emissions. Generally there are four methods to lower the viscosity that are heating, blending, micro-emulsification and transesterification. Heating is the easiest solution to bring lower the viscosity. Biodiesel and its blends were heated up before combustion process and most of the researcher reported that the brake power was lower than diesel fuel but higher than unheated biodiesel while the BSFC was found to be higher than diesel fuel and unheated biodiesel. In addition, it observed that the NOxemission was higher than that of diesel fuel and unheated biodiesel.

Spray Characteristics at Preheating Temperatur of Diesel-Biodiesel-Gasoline Fuel Blend

“…Increased preheating temperatures of fuel affect spray tip penetration and spray angle, similar thing happened in the spray area and volume spray [15]. As for engine performance and emissions, heating of biodiesel and its blend can improve engine performance, reducing CO emissions, although there is still an increase in NOx emissions due to higher combustion temperature [13], [16][17].…”

The performance of a developed diesel vehicle to run on WCO biodiesel at variable speeds and loads

“…The BSFC of methyl ester is higher than that of diesel fuel. Diesel fuel has the lowest exhaust gas temperatures (EGT) but increases as the methyl ester content in the blend increases (Chhabra et al 2016;Dinesha and Mohanan 2012;Mustaffa et al 2014;Singh 2013).…”

Safety Working Environment at Highway: Safety Warning Detector (SWAD) System

“…The sensor application was not limited to electronic board system for programming only. But, the sensor could be apply in material composite fabrication 13) , injection moulding 14) , oil palm industry, burner system 15) and automotive industry 16) .…”